Front brake calliper I.D. please

[Joolstacho]

I need to get new front pads, but I need to make sure I get the correct type. The bike is an '89 model. I know the calliper was changed in '04 to AJP, and my calliper has AJP cast on it. Can anyone tell from this pic? (I can do close-ups if necessary)
-Jools

[adidasguy]

You have the newer caliper. On the older ones the pistons were different sizes.

[Joolstacho]

Thanks mate, that was quick!
The exploded view on the Wiki shows an '89-'96 calliper and a '96 to current calliper, but in the 'year changes' section it says "1996 minor changes" Then I see another change in 2004 to AJP type.
Guess I might have to pull them out to check.

[gsJack]

I have an AJP caliper from a 09 on my 02 GS.  Front pads are same for all years 96-09.  Calipers were a different design on 89-95 models with different pads.  All rears same from 89-09. 

[Joolstacho]

Brilliant boys, thanks.
-Jools

[catch2otwo]

Are the later model 96-09 calipers worth swapping onto an 89 model?  are you guys changing the master cylinder too?